Introduction to Triangle

Q.

An equilateral triangle has 2 sides equal. True or False?

1. True

2. False

Q.

Total number of parts in a trianlge is:

1. 6

2. 9

3. 3

4. 4

Q. Answer the following:
(i) Angle opposite to CA in the $\Delta ABC$.
(ii) Side opposite to $\angle A$ in $\Delta AOD$. [2 MARKS]

Q.

Number of line segments required to construct a triangle are

1. 2

2. 4

3. 5

4. 3

Q. Name the following types of triangles:
a)Triangle with length 9m, 9m, 9m
b)Triangle with length 6m, 6m, 9m
c) Triangle with angles 40${}^{\circ }$, 60${}^{\circ }$, 80${}^{\circ }$
d)Triangle with angles 90${}^{\circ }$, 40${}^{\circ }$, 50${}^{\circ }$
e)Triangle with angles 110${}^{\circ }$, 10${}^{\circ }$, 60${}^{\circ }$
f)Tiangle with angles 70${}^{\circ }$, 70${}^{\circ }$, 40${}^{\circ }$
[4 MARKS]

Q.

A polygon formed by joining three points in a plane is called a ___ .

Q. State whether the statement is true or false.
A triangle has 3 sides.

1. False
2. True

Q.

Which of the following is true?
(i) A triangle can have two obtuse angles.
(ii) A triangle can have all angles equal to ${60}^{\circ }$.
(iii) A triangle can have all angles more than ${60}^{\circ }$.

1. Only (ii)

2. Only (i)

3. Only (iii)

4. All (i), (ii), (iii)

Q.

The property which states that the sum of all the interior angles of a triangle is 180${}^{\circ }$ is known as __.

Q.

Sum of the interior angles of a triangle is

1. 360

2. 135

3. 180

4. 90

Q.

If a $△QPR$ is right angled at $P,$ then which is the longest side of the triangle?

1. PQ

2. QR

3. PR

4. Can't be determined.

Q.

The number of line segments required to construct a triangle is:

1. 2

2. 3

3. 4

4. 5

Q. What is the minimum number of sides needed to create a polygon?

1. 1
2. 2
3. 3
4. 4

Q.

The six elements of a triangle are its $a$ sides and $b$ angles. Find the value of $a\times b$

1. $9$

2. $12$

3. $4$

4. $6$

Q.

The number of diagonals in a triangle is___.

Q. A triangle must have at least two ________.

1. acute angles
2. right angles
3. straight angles
4. obtuse angles

Q.

Choose the correct answer

The largest angle is always opposite to the ___________ side.

1. Largest

2. Smallest

3. Middle

Q.

If a $△$QPR is right angled at P, then which is the longest side of the triangle?

1. PQ

2. QR

3. PR

4. Can't be determined.

Q.

An isosceles triangle is symmetrical about its ________ passing through a common vertex of equal sides.

Q. State, giving reasons, which of the following pairs of sets disjoint sets and which are overlapping sets:
P = {Students of class IX studying in I.C.S.E. Board} and Q = {Students of class IX}

Q. A closed figure which has three sides is called:

1. Rectangle

2. Triangle

3. Square

4. Hexagon

Q. A triangle has 3 sides

1. True
2. False

Q.

How many interior angles does a triangle have?

1. 1

2. 2

3. 3

4. 4

Q. What is the least number of sides a Polygon can have?

1. 2
2. 1
3. 3
4. 4

Q. Simple plane closed figure bounded by three line segments is called as:

1. angle
2. triangle
3. square
4. circle

Q. A closed figure made by joining three non-collinear points is called

1. Rectangle

2. Triangle

3. Square

4. Hexagon

Q.

How many interior angles does a triangle have?

1. 1

2. 2

3. 4

4. 3